Until the arrival of PanPan crew relied on owners / skippers to provide man overboard alerting systems, or had to spend a fair bit of money themselves. With the free PanPan app available for Android and iPhone together with the affordable PanPan Beacon itself that situation changes now! 
Simple to use and set up,  with potentially no cost to a boat owner (unless they actually like the idea of the crew knowing if they fall in!), and affordable for crew,  the main barrier to entry in using these systems is gone. 
Anything that improves the chances of finding a person overboard quickly has to be a good thing,  and with Christmas just around the corner this could be just the thing to help the Sailor in your life stay in your life......